CVE•Published 2021-03-03•Modified 2026-10-01•3 articles on news•7 live references•NVD data
CVE-2021-26858Microsoft · Exchange_server
Vulnerability data via NVD (ingested)
CVSS v3.1
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS percentile
100
Exploit Prediction Scoring System · top 0% of all CVEs
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
Timeline
Published 2021-03-03
Modified 2026-10-01
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag627 hosts
vuln:CVE-2021-26858Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Microsoft Exchange Server" version:"2013"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Exchange Server"HTTP body or banner mentions "Exchange Server" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-26858Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-26858Censys host search filtered to this CVE id.
grep.app
CVE-2021-26858Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-26858GitHub code search for direct mentions.
Google dork
"CVE-2021-26858" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (7)
CVE-2021-268587 repos
Mr-xn/Penetration_Testing_POCHTML
渗透测试有关的POC、EXP、脚本、提权、小工具等---About penetration-testing python-script poc getshell csrf xss cms php-getshell domainmod-xss csrf-webshell cobub-razor cve rce sql sql-poc poc-exp bypas…
Threekiii/Awesome-POCJava
一个漏洞 PoC 知识库。A knowledge base for vulnerability PoCs(Proof of Concept), with 1k+ vulnerabilities.
SexyBeast233/SecBooksHTML
安全类各家文库大乱斗
GhostTroops/TOPShell
TOP All bugbounty pentesting CVE-2023- POC Exp RCE example payload Things
Ostorlab/KEVunknown
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
kh4sh3i/exchange-penetration-testingPowerShell
The great Microsoft exchange hack: A penetration tester’s guide (exchange penetration testing)
vehemont/nvdlibPython
A simple wrapper for the National Vulnerability CVE/CPE API